A fatal security breach at Denver International Airport (DEN) has left one person dead and several passengers injured after a trespasser climbed onto an active runway and was struck by an outbound commercial flight late Friday. Airport officials confirmed the incident in a public statement released Saturday, laying out the timeline of the unprecedented event.
According to DEN authorities, the unnamed individual successfully scaled a perimeter security fence at approximately 11:17 p.m. local time, and crossed onto a active runway just two minutes later. That same moment, Frontier Airlines Flight 432, a regularly scheduled Airbus A321 service bound for Los Angeles International Airport, was in the early stages of its takeoff roll. The aircraft struck the pedestrian, prompting the flight crew to immediately abort takeoff and bring the plane to a safe stop on the runway.
Airport communications confirmed the pedestrian was pronounced dead at the scene. Officials have confirmed the deceased individual is not an airport employee, and no formal identification has been released to the public as of Saturday. Unnamed law enforcement sources cited by ABC News reported that the person was at least partially ingested by one of the aircraft’s jet engines following the collision.
Audio recordings of air traffic control communications released by ATC.com capture the immediate panic of the flight crew after the collision. “We’re stopping on the runway, we just hit somebody, we have an engine fire… There was an individual walking across the runway,” the lead pilot told controllers in the urgent transmission.
Denver Fire Department crews responded rapidly to the scene and confirmed that a small engine fire sparked by the collision was fully extinguished within minutes. All 224 passengers and seven crew members on board were immediately evacuated via emergency slides to the runway surface. Airport officials confirmed 12 passengers sustained minor injuries related to the evacuation, with five patients transported to nearby Denver-area medical facilities for observation and treatment.
U.S. Transportation Secretary Sean Duffy released an official statement via social media platform X Saturday addressing the breach, emphasizing the danger of unauthorized access to airport airside areas. “Late last night, a trespasser breached airport security at Denver Int’l Airport, deliberately scaled a perimeter fence, and ran out onto a runway” and was struck by the plane “during takeoff at a high speed,” Duffy wrote. “No one should EVER trespass on an airport.”
DEN inspectors completed an immediate examination of the perimeter fence line following the breach and confirmed the barrier remained structurally intact with no pre-existing damage that facilitated the trespasser’s entry. Local law enforcement is leading the primary investigation into the incident, with the National Transportation Safety Board notified and assisting with the probe. Runway 17L, where the collision occurred, will remain closed to air traffic for the duration of the on-scene investigation.
Frontier Airlines released a formal statement Saturday expressing condolences over the fatal event. “We are investigating this incident and gathering more information in coordination with the airport and other safety authorities,” the carrier said. “We are deeply saddened by this event.”